I did a b16a swap in my 90 CRX DX so I had to convert from dpfi to mpfi. After doing the swap I had noticed that it was running really rich. I have been driving the car for about 6 months after the swap now, and in that time I have done multiple things to try to fix it. It is so bad that I am getting around 12MPG. In that time I have brought it to the shop and had different mechanics take a look at it. They changed the O2 sensors, and the injectors, and the timing belt. That didnt fix the problem. I was throwing a code for knock sensor so I bought a vtec sub wiring harness and that had the knock sensor wiring and after that was installed the CEL went off. I have also done a tune up, and even put in a brand new Dizzy. I changed the resistor box, and I have a PR3 ecu and a PW0 ecu that both do the same thing when installed in the car. I changed the Map sensor.
I have checked the vacuum set up and that is good, the wiring was all done by the directions (http://tech.hybridgarage.com/)And checked multiple times. I have no vacuum leaks and the compression is 210 across.
My symptoms are about 12mpg, blowing out alot of black smoke when reving up. Uncontrollable idle, Idles high when cold (around 2500) and then real low when warm (dies if let without hitting gas), When I start out the car boggs down alot like to much fuel, When driving at a constant speed the car is real jumpy as if I am hitting and letting off the gas constatly.

Can somebody help me I need my car back. I dont have a VAFC or anything like that and I dont want something like that to just cover up the problem.

 

hey I'm not sure if you have a fuel regulator or just a mad *** fuel pump in the tank, I use to have the same problem when I had a walbro 255lph fuel pump, you should try lowering your fuel pressure regulator, it'll help alot.. and double check both o2 sensor to make sure they are wired up correctly..

 

im thinking its the tps..my bad tps made the engine do that stuff you're describing ,,,,,,,,but the ecu threw a code.....

 

How can I adjust my fuel pressure regulator, if all i have is my stock one?

 

I still think that itis in the wiring. You should have your wiring looked over by someone who knows swaps.

 

I have

 

hey, changed out the map sensor, are you sure you didn't mix up the wiring between the map sensor and throttle postioner sensor, also theres I believe it's the idle air control, it's that thing behind the manifold that takes coolant into and through it, if that's bad then it can cause it to run bad too, as well as the crank angle sensor or cylinder postioner sensor I believe it's the sensor located on your tranny with a yellow wire and green wire. check all those areas first and let us know..

 

are you sure you're using OBD0 injectors with the resistor box? if you use OBD1 (high impedance) injectors with a resistor box (which is meant to lower the impedance) it is gonna make things a little screwed up. are you using a stock fuel pressure regulator? also double check that you have the TPS wired right. you have to swap 2 of the wires when switching to MPFI.

 

I checked and they have ~2 Ohms of resistance so they are OBDO injectors.


Modified by 90jdmcrxdude at 5:24 PM 7/4/2006